US3851540A - Perpendicularly meshing spur gearing - Google Patents

Perpendicularly meshing spur gearing Download PDF

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Publication number
US3851540A
US3851540A US00372572A US37257273A US3851540A US 3851540 A US3851540 A US 3851540A US 00372572 A US00372572 A US 00372572A US 37257273 A US37257273 A US 37257273A US 3851540 A US3851540 A US 3851540A
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United States
Prior art keywords
gear
tooth
teeth
meshing
mating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00372572A
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English (en)
Inventor
H Tutiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Watch Co Ltd
Original Assignee
Citizen Watch Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Watch Co Ltd filed Critical Citizen Watch Co Ltd
Application granted granted Critical
Publication of US3851540A publication Critical patent/US3851540A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/08—Profiling
    • F16H55/0846—Intersecting-shaft arrangement of the toothed members
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B13/00—Gearwork
    • G04B13/02—Wheels; Pinions; Spindles; Pivots
    • G04B13/027—Wheels; Pinions; Spindles; Pivots planar toothing: shape and design
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B27/00—Mechanical devices for setting the time indicating means
    • G04B27/02—Mechanical devices for setting the time indicating means by making use of the winding means
    • G04B27/04—Mechanical devices for setting the time indicating means by making use of the winding means with clutch wheel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19884—Irregular teeth and bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19949—Teeth
    • Y10T74/19963—Spur
    • Y10T74/19972—Spur form

Definitions

  • the perpendicularly meshing spur gearing is especially [30] Foreign Application Priority Data adapted for use between the winding pinion and the crown wheel of a timepiece and is characterized by a June 24, 1972 47'750l9 single projecting in the addendum of each tooth and I an undercut on the same side of the tooth in the dedendum of each tooth.
  • the projections are in the 58] Fieid h 74/437 462 plane of each gear and are maintained in engagement earc during the whole engaging period of the related gear tooth.
  • a further drawback resides in severe wearing at the mating parts of the gearing.
  • the worn-out fine metal particles may interfere with smooth meshing of various gearings provided in the timepiece, by invading into the various gear meshing areas.
  • the main object of the present invention is to provide a substantially improved spur gearing which is substantially devoid of the aforementioned disturbing forces.
  • a further object is to provide a spur gearing of the above kind which can operate with least possible wearing.
  • the invention resides for fulfilment of the aforementioned various objects, in a transmission gearing comprising two mutually perpendicularly engaging spur gears, each tooth of at least one gear of said gearing having a rounded and circumferentially projecting motion-transmitting projection positioned in its pseudoaddendum range and directing towards itsmating gear, said projection being kept in contact therewith substantially during the whole engaging period of the related gear tooth.
  • the said tooth may preferably be formed with an undercut beginning from the root portion of said projection and extending through the pseudodedendum range of the gear tooth to the root circle.
  • FIG. 1 is a rear side plan view of essential part of a watch embodying the principles of the invention, showing a close proximity part to the winding stem, several parts being broken away-for demonstrating inner working parts andcertain parts being shown only partially for simplicity.
  • FIG. 2 is a sectional view taken along the section line II-ll in FIG. 1 and in a reduced scale relative thereto.
  • FIG. 3 is an illustrating schematic view of a part of a pair of mutually engaging gears constituting the inventive spur gearing, said gears being shown in their devel-' oped plan on a common plane for easy understanding of the invention.
  • FIG. 4 is an enlarged plan view of a preferred embodiment of the tooth form of an improved winding pinion according to this invention.
  • FIG. 5 is a similar view to FIG. 4, illustrative of a preferred embodiment of the tooth form of an improved crown wheel according to this invention and capable of meshing with the winding pinion shown in FIG. 4.
  • numeral 11 represents a winding stem which is held in a radial bore formed within the material of a pillar plate 12, only partially shown, said bore comprising a small diameter portion 12a and a large diameter portion 12b.
  • the stem 11 is formed with a ring groove 11a with which a conventional setting lever 13, only partially shown, is kept in engagement, for positioning the axially slidable stem, as conventionally.
  • the stem 11 comprises a square cross-sectioned first portion 11b and a cylindrical cross-sectioned second portion 11c.
  • a clutch wheel 14, having a square central bore 140, is slidably mounted on the said first stem portion 11b, while a winding pinion I5 is mounted on the said second stem portion 110.
  • Clutch wheel 14: and winding pinion 15 are formed with mutually engageable clutch teeth 14b and 15a, respectively.
  • Clutch wheel 14 is formed with a ring groove 14c which which a conventional clutch lever 16, only partially shown, is kept in engagement, for allowing the clutch wheel to slide relative to the stem 11 for clutching or declutching the both wheels 14 and 15.
  • a bridge 17, shown only in its section in FIG. 2, is fixedly mounted on the plate 12 by means of screw means, not shown, said bridge having a boss 17a on which a conventional crown wheel 18 isrotatably mounted.
  • a headed screw 19 is threaded into said boss 17a for holding the crown wheel 18* in position.
  • the wheels 15 and 18 are arranged at right angles precisely or substantially to each other, so far as their mutual gear meshing is concerned. These wheels 15 and 18 have spur gear-like teeth in spite of their mutually perpendicular gear meshing.
  • the present invention provides optimal gear tooth configuration highly adapted for such gear meshing, as may be well supposed at aglance of FIGS. 1, 3, 4 and 5.
  • clutch wheel 14 By turning the stem 11 manually in either direction, clutch wheel 14 will be turned inunison therewith.
  • the torque necessary for the execution of barrel winding is rather large.
  • a torque in the order of 40 grcin is necessary when measured at the position of the winding pinion 15.
  • FIG. 3 represents an imaginary figure wherein the gear main plane of winding pinion 15 has been rotated around an imaginary line alpha" which is a crossing line of the righthand side surface of winding pinion 15 with the lower side surface of crown wheel 18 when seen in FIG. 2, or briefly between the inside side surfaces of the both wheels, so as to bring the said gear plan of the winding pinion on that of the wheel 18.
  • the centers of rotation of these pinion and wheel 15; 18 are shown at O and 0 respectively.
  • H and H represent the face widths measured on winding pinion 15 and crown wheel 18, respectively.
  • FIG. 3 illustrates the gear meshing conditions between these pinion and wheel seen at a specific time point
  • this graphical representation may be deemed that it represents successive tooth engaging modes between the teeth Q 'and Q of the both gearing members 15 and 18, through the following coupling stages as at R, and R and S and S respectively.
  • the line beta represents a common tangent to the both prongs 15b and 18a.
  • the tooth-meshing takes place on the line gamma.
  • the line gamma represents a common tangent of the same nature.
  • the tooth-meshing between S and S takes place at its final stage .on the line delta which represents the similar common tangent of the above nature.
  • the whole engaging period between the related and cooperating teeth of the both wheel members 15 and 18 may be defined by the horizontal space distance between the both imaginary lines beta and delta.”
  • the distances L and L defining the center-tocenter distance between 0 and 0 are selected by consideration of other design factors of the timepiece.
  • the modules of the both wheel members 15 and 18 are selected by consideration of the degree of machinability, the strength of the mating teeth relative to the transmitting torque, and the like.
  • the position and rounding radius of each of the prong projections 15b; 18a may be determined by consideration of the following conditions (see, FIG. 3).
  • each practical sample of the tooth forms of the both wheel members or winding pinion and crown wheel are representatively shown, under such assumption that L 1,100 microns; L 1,700 microns.
  • the machining of the winding pinion and the crown wheel can be performed by punching, milling, broaching or the like conventional technique.
  • the pseudoaddendum relative to the pinion may be defined by the lower projecting part of each tooth on the pinion relative to the line alpha, while the pseudodedendum of the pinion may be defined by the upper or remaining part of the same tooth in FIG. 3. Similar definitions may equally be considered relative to the mating wheel 18. These definitions may advantageously be adopted in resemblance to the commonly used sense of the addendum and dedendum of a gear, for the determination of the position and function of the aforementioned rounded prong projections 15b; 18a serving specifically for motion transmitting purpose in the peculiarly mating gear members as at 15 and 18.
  • undercuts 15c; 18b serves for avoiding otherwise possible interference in the gearmeshing.
  • a transmission gearing comprising two mutually perpendicularly engaging spur gears, each tooth of at least one gear of said gearing having a rounded and locally projecting motion-transmitting projection positioned in its pseudoaddendum range within the tooth width of the mating gear during meshing and directed towards its mating gear, each of said projections being kept in contact with the related tooth of the mating gear substantially during the whole engaging period of the related gear teeth.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
US00372572A 1972-06-24 1973-06-22 Perpendicularly meshing spur gearing Expired - Lifetime US3851540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972075019U JPS4933865U (de) 1972-06-24 1972-06-24

Publications (1)

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US3851540A true US3851540A (en) 1974-12-03

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JP (1) JPS4933865U (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328140A1 (fr) * 1975-10-16 1977-05-13 Seikosha Kk Train d'engrenages a sens unique de rotation
US4051744A (en) * 1976-10-15 1977-10-04 Kabushiki Kaisha Seikosha Gear mechanism for preventing reverse rotation
US4939953A (en) * 1987-12-08 1990-07-10 Toyota Jidosha Kabushiki Kaisha Limited slip differential
FR2679667A1 (fr) * 1991-07-10 1993-01-29 Timex Corp Mecanisme de mise a l'heure d'un mouvement d'horlogerie.
EP1820590A2 (de) 2006-02-21 2007-08-22 Siemens Aktiengesellschaft Verfahren zur Herstellung von Räumwerkzeugen
US20080245171A1 (en) * 2007-04-04 2008-10-09 Eta Sa Manufacture Horlogere Suisse Single direction coupling device and correction device including the same
US20080247277A1 (en) * 2007-04-04 2008-10-09 Eta Sa Manufacture Horlogere Suisse Correction device for timepiece display mechanism and wheel fitted thereto
US20130145876A1 (en) * 2010-01-29 2013-06-13 South China University Of Technology Space curve mesh driving pair and polyhedral space curve mesh transmission
FR3131016A1 (fr) * 2021-12-21 2023-06-23 Pequignet Horlogerie Engrenage de remontoir

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436231A (en) * 1945-10-20 1948-02-17 R W Cramer Company Inc Self-starting synchronous motor
US3701287A (en) * 1969-10-02 1972-10-31 Philips Corp Toothed gearing

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2436231A (en) * 1945-10-20 1948-02-17 R W Cramer Company Inc Self-starting synchronous motor
US3701287A (en) * 1969-10-02 1972-10-31 Philips Corp Toothed gearing

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2328140A1 (fr) * 1975-10-16 1977-05-13 Seikosha Kk Train d'engrenages a sens unique de rotation
US4051744A (en) * 1976-10-15 1977-10-04 Kabushiki Kaisha Seikosha Gear mechanism for preventing reverse rotation
US4939953A (en) * 1987-12-08 1990-07-10 Toyota Jidosha Kabushiki Kaisha Limited slip differential
FR2679667A1 (fr) * 1991-07-10 1993-01-29 Timex Corp Mecanisme de mise a l'heure d'un mouvement d'horlogerie.
EP1820590A2 (de) 2006-02-21 2007-08-22 Siemens Aktiengesellschaft Verfahren zur Herstellung von Räumwerkzeugen
EP1820590A3 (de) * 2006-02-21 2008-07-02 Siemens Aktiengesellschaft Verfahren zur Herstellung von Räumwerkzeugen
US20080245171A1 (en) * 2007-04-04 2008-10-09 Eta Sa Manufacture Horlogere Suisse Single direction coupling device and correction device including the same
US20080247277A1 (en) * 2007-04-04 2008-10-09 Eta Sa Manufacture Horlogere Suisse Correction device for timepiece display mechanism and wheel fitted thereto
US7823476B2 (en) * 2007-04-04 2010-11-02 Eta Sa Manufacture Horlogère Suisse Single direction coupling device and correction device including the same
US7957226B2 (en) 2007-04-04 2011-06-07 Eta Sa Manufacture Horlogère Suisse Correction device for timepiece display mechanism and wheel fitted thereto
US20130145876A1 (en) * 2010-01-29 2013-06-13 South China University Of Technology Space curve mesh driving pair and polyhedral space curve mesh transmission
US8789438B2 (en) * 2010-01-29 2014-07-29 South China University Of Technology Space curve mesh driving pair and polyhedral space curve mesh transmission
FR3131016A1 (fr) * 2021-12-21 2023-06-23 Pequignet Horlogerie Engrenage de remontoir

Also Published As

Publication number Publication date
JPS4933865U (de) 1974-03-25

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